Denver Colfax Marathon

Race Date

May 17, 2026

Location

Denver, CO

Logistics

Race Day

Sunday, May 17, 2026

Start Time

TBA

Start Location

Denver, CO

Directions

Course Info

USATF Certified

Course Type

Loop Course

Terrain

road

Difficulty

Ultra-Flat

Net Drop/km

0 m (Flat)

Separation

0.2%

Also Offers

26.2M10M run | 26.2M relay

USATF Certified Course

CO23004DT · Expires 2033 · Colfax Half Marathon

Relatively flat with minimal net elevation change. Loop course — start and finish are close together.

View USATF Course Map (PDF)

Historical Performance

Median Finish

2:14:18

10:15/mi

Winning Time

1:03:05

4:49/mi

Finishers (2025)

6,002

States Represented

46 / 50

Gender Split

54% Female46% Male

Finish Time Distribution

1:004:50

FASTER 25%

1:57:43

MEDIAN

2:14:18

SLOWER 25%

2:34:07

Average runner age: 36

See Full Results

Race Day Weather

5-year historical avg

Start (Low)

45°

Afternoon (High)

72°

Warm — hydration strategy is key, start conservatively

0.1"

Precipitation

12 mph

Wind

56%

Humidity

Explore More Journeys

Can't make it to Denver? Discover other experiences that match your running style.

Search All Races

Denver, CO • Sep 14

Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race

Centennial, CO • Apr 4

Always Hope Easter Run 5K/10K/13.1 DENVER/AURORA

Englewood, CO • Apr 5

Three Creeks Half Marathon

Never miss
another
finish line.

Join our community of 350K+ half marathon runners. Get notified about new races, registration opens, and early bird pricing across all 50 states.